I wanted to share a simple way another blogger has to gather information. Dave Gray of Communication Nation asks: http://communicationnation.blogspot.com/2008/06/who-are-you.html#links

Additionally, and not to state the obvious — while we may all be of different e.g. backgrounds, ideas, education levels, etc. — behaviouraly we share a common characteristic: we are very interested in Mercury Grove.

Finally, you may wish to consider this question from two different angles: 1- yours and 2- ours. Your angle is to better understand your audience to be able to better tailor your messages to them. Our angle is to get the information we want in the ways that we want. While the objectives are mutually compatible, it is perhaps best summed up by Abe Lincon (perhaps the first to debunk 1-to-1 marketing):

“You can please all of the people some of the time; some of the people all of the time; but never all of the people all of the time.”